It looks like you're using Internet Explorer 11 or older. This website works best with modern browsers such as the latest versions of Chrome, Firefox, Safari, and Edge. If you continue with this browser, you may see unexpected results.
Analyst reports, particularly initiating coverage reports, can be good sources for comparative information. Search for your company, then select Research-->Company Research to view reports and change criteria, such as adding "initiating coverage" as a parameter. Use the Screening & Analysis-->Research-->Research Search function to look more broadly for keywords or industries.
Books are often good sources for in-depth company history information. Use Franklin, the Penn Libraries Catalog, to search for books about a specific company. Use the Subject heading Browse option to enter a company name, then select a relevant subject from the list. For example, to browse for books about McDonald's: